Distribution of bound and free ascorbic acid in plasma and tissues of male chickens.
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In order to elucidate the nutritional and physiological role of bound and free ascorbic acid in the chicken, the distribution of these two forms of ascorbic acid in the tissues of White Leghorn male chickens was studied. Bound and free ascorbic acid in the plasma and tissues of the chickens were determined by the α, α′-dipyridyl method. Bound and free forms of ascorbic acid were separated by gel filtration on Sephadex G-25M column and were found in the high molecular weight fraction and the low molecular weight fraction, respectively.The order of the concentration of bound ascorbic acid in the tissues was given as adrenals>liver>lungs, thyroids, spleen, kidneys>pancreas, brain>testes>plasma. On the other hand, the order of the concentration of free ascorbic acid was given as adrenals>spleen>brain>liver>lungs>thyroids, pancreas, testes>kidneys>plasma. The ratios of the content of bound ascorbic acid to that of free ascorbic acid in the plasma and tissues were smaller than 50%. Consequently, the tissue contents of bound form were generally lower than that of free form. The highest ratio of the content of bound form to that of total ascorbic acid was observed in the plasma (29.9%) and the ratios in other tissues ranged from approximately 3 to 17%.These results indicate that there are differences between bound form and free form in the tissue distribution of ascorbic acid in chickens and the tissue contents of bound form are generally lower than that of free form. Further study, however, will be required to clarify the differences of the nutritional and physiological function between bound and free ascorbic acid.
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